Successive waves of Russian missile strikes have crippled almost half of Ukraine’s energy system, Prime Minister Denys Shmyhal said on Friday, as heavy fighting raged in areas in the east and south.

With temperatures falling and the capital Kyiv seeing its first snow of the winter, authorities were working to restore power nationwide after some of the heaviest bombardment of Ukrainian civilian infrastructure during nine months of war.

“Unfortunately Russia continues to carry out missile strikes on Ukraine’s civilian and critical infrastructure. Almost half of our energy system is disabled,” Shmyhal said.

President Volodymyr Zelensky said earlier about 10 million people were currently without power in a country with a pre-war population of about 44 million. He said authorities in some areas ordered forced emergency blackouts.

Russia’s defence ministry said its forces had used long-range weapons on Thursday to strike defence and industrial facilities, including “missile manufacturing facilities”.

Investigators in liberated areas of Kherson region have uncovered 63 bodies bearing signs of torture after the Russian forces left, Ukraine’s interior minister was quoted as saying.

Russia, for its part,accused Ukraine of executing more than 10 Russian prisoners of war with direct shots to the head.